Travel Management - Trip Limit

Hi Guys,
I need to set a limit on Trips Expenses so that the company would pay for employees ticket to visit home and return but only once a year=2E That personal trip is company paid and booked by the company for the employee and upto 2 family members in advance, but if it happened that an employee wanted to visit home again in the same year he would have to pay for it himself provided he gets leave appoval or if it is a holiday=2E

So where can i set this rule that an employee gets no more then ONCE a year a personal trip (company paid) for himself and upto 2 family members?

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